image upload & thumbnails

[timbr8ks]

I am trying to create a neat little system that will allow me to upload an image and save it plus a thumbnail. It works fine until I get to an image that's over 100kb. When I try to upload an image that's 101kb, I get this message:

Fatal error: Allowed memory size of 8388608 bytes exhausted (tried to allocate 8496 bytes) in [path name removed] on line 27

Here is the code:

<?php
if (@$_POST['submit']) {

if (is_uploaded_file($_FILES['infile']['tmp_name'])) {
	$filename		= $_FILES['infile']['name'];
	$sizes = getimagesize($_FILES['infile']['tmp_name']);
	$width = $sizes[0];
	$height = $sizes[1];
	$path 		= '[path name removed]';
	if (move_uploaded_file($_FILES['infile']['tmp_name'], $path.$filename)) {

		@chmod($filename,0666);

		if ($width > 75) {
			$newwidth = 75;
			$proportion = 75/$width;
			$newheight = round($height*$proportion,0);
		} elseif ($height > 75) {
			$newheight = 75;
			$proportion = 75/height;
			$newwidth = round($width*$proportion,0);
		}

		if (@$newheight) {
			$thumb = "th_".$filename;
			error_reporting (E_ALL);
			$abc = imagecreatefromjpeg($filename); 
			$def = imagecreate($newwidth, $newheight); 
			imagecopyresized($def, $abc, 0, 0, 0, 0, $newwidth, $newheight, $width, $height); 
			imagejpeg($def, $thumb, 95); 
			imagedestroy($abc); 
			imagedestroy($def); 

			@chmod($thumb,0666);

			print "
			original: ($width x $height)<hr><img src=\"$filename\"><br><br><br>new:($newwidth x $newheight)<hr><img src=\"$thumb\"></BODY></HTML>";
		} 


	} else {
		$m="could not copy image";
	}

} else {
	$m = "file could not be uploaded";
}
}
?>

The form is pretty straight-forward and looks like this:

<form action="<?= $PHP_SELF; ?>" method="post" enctype="multipart/form-data">
<input type="hidden" name="MAX_FILE_SIZE" value="80000000">
image: <input type="file" name="infile"><br>
<input type="submit" value="submit" name="submit">
</form>

Can anyone tell me what I'm missing? My server allows uploads of up to 2MB.

Thanks.

[Mordecai]

Ignore file size, it's irrelevant (well, not entirely.. but it doesn't take up near as much as the uncompressed image). What you're doing is taking the image, uncompressing it, and storing it in memory. This takes up space extremely fast. If a truecolor image has 24 bits per pixel and is 100x100 pixels, it takes up 240000 bits, or 30000 bytes, or 30Kb. As you can see, it takes up a large amount of space very easily.

What you need to do is either:
1) Increase the memory allocation for that script. This can be done with an [man]ini_set/man of memory_limit.
2) Port it out to an external program. It's pretty easy to write a C program that uses gd. The syntax for C is very similar to PHP (actually, PHP is very similar to C), so you'll most likely catch on quickly. This route will be much faster, and you won't have to worry about the memory limit of PHP.

Hope that helps.